I've said this before and I will say it again. IF you use the eastern arc service with ALL MPEG 4 channels being broadcast , you should get more internal hard drive space on your hard drive because mpeg 4 takes up less room than mpeg 2. Mpeg 4 should look better too, in regards to picture quality. I would compare and tell you if it looks better if I ever get my replacement smart cards . I have both a dish 1000.4 and a dish 1000.2. I could keep one of my dvrs on the western arc and one on the eastern arc, record the same show and see what the hard drive space is once I move it to my external hard drive.
I'm not so sure about that theory. I believe the extra compression rate given by the MPEG4 vs the older MPEG2 format is useful in decreasing needed bandwidth to send signals down to your receivers...but is not utilized for storage amount on your DVR. For example, a year ago when I recorded a program an hour long on ESPNHD (MPEG2), it took the same amount of space as when I recorded an hour long program on Universal HD (MPEG4). Maybe I'm wrong, but before the switch to all MPEG4 HD in August, I never noticed any difference in storage amount.